print/ghostscript9-agpl-base: add patch to fix CVE-2023-28879

and bump PORTREVISION. vulndb update in upcoming separate commit.

Security: CVE-2023-28879
Security: 25872b25-da2d-11ed-b715-a1e76793953b
PR: 270823
MFH: 2023Q2
Approved by: hrs@ through maintainer timeout, 15d